added interpolation for zoom levels where there is no data available. 
added interpolation for zoom levels where there is no data available. 
KarlaRenschler/gfw,apercas/gfw,KarlaRenschler/gfw,apercas/gfw,cciciarelli8/gfw,Vizzuality/gfw,KarlaRenschler/gfw,codeminery/gfw,Vizzuality/gfw,codeminery/gfw,cciciarelli8/gfw,apercas/gfw,codeminery/gfw,apercas/gfw,codeminery/gfw,KarlaRenschler/gfw